Bump org.mockito:mockito-core from 5.5.0 to 5.6.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.5.0...v5.6.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

gradle/dependencies.gradle

@@ -28,7 +28,7 @@ ext {
     test_versions = [
             junit         : '5.10.0',
             hamcrest      : '2.2',
-            mockito_core  : '5.5.0',
+            mockito_core  : '5.6.0',
             jsonassert    : '1.5.1',
             rest_assured  : '5.3.2',
             commons_codec : '1.16.0',